| Class | Age |
| Preparatory | 4 years as on 31st March |
| I | 5 years as on 31st March |
| II | 6 years as on 31st March |
| III | 7 years as on 31st March |
| IV | 8 years as on 31st March |
| V | 9 years as on 31st March |
| VI | 10 years as on 31st March |
| VII | 11 years as on 31st March |
| VIII | 12 years as on 31st March |
| IX | 13 years as on 31st March |
| X | 14 years as on 31st March |